@article{WeinkaufTheiselHegeetal.2006, author = {Tino Weinkauf and Holger Theisel and Hans-Christian Hege and Hans-Peter Seidel}, title = {Topological structures in two-parameter-dependent 2D vector fields}, journal = {Computer Graphics Forum}, volume = {25 (3)}, pages = {607 -- 616}, doi = {10.1111/j.1467-8659.2006.00980.x}, year = {2006}, }